Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b401eeaf16cb2a9…

MALICIOUS

PDF

48.5 KB Created: 2020-08-05 15:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f97b58b5055186077574617d82be63ab SHA-1: 811081794d63b17fbc5b904ce65c89dc962d6b00 SHA-256: 9b401eeaf16cb2a9eebdd51ec87c2e9f001de761cdf95bc6aa608d2af0f81656
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised with keywords suggesting a downloadable module. The document body also contains this URL and numerous other links to PDFs hosted on Shopify, indicative of an SEO poisoning or link farm tactic. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wb?keyword=grade%2010%20filipino%20module%20pdf%20download%20answer%20key
    • http://files.diamondbackcombatives.com/uploads/1/3/1/4/131454523/5842649a1a067b.pdf
    • http://files.annmaglinte.com/uploads/1/3/0/7/130775649/3475149.pdf
    • http://files.ccyogaschool.com/uploads/1/3/0/7/130740551/9580402.pdf
    • http://files.milehightransport.com/uploads/1/3/2/7/132712603/tigutigitit_dofudopufivu_mamupaluzo_dewawabugox.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/43963136039.pdf
    • https://cdn.shopify.com/s/files/1/0434/0390/3127/files/designing_power_supplies_for_valve_amplifiers.pdf
    • https://cdn.shopify.com/s/files/1/0438/9833/9496/files/57578104042.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/wemebarirovaveler.pdf
    • https://cdn.shopify.com/s/files/1/0436/6126/3001/files/caste_category_list_in_rajasthan.pdf
    • https://cdn.shopify.com/s/files/1/0431/7085/7124/files/15512752564.pdf
    • https://cdn.shopify.com/s/files/1/0434/0488/6166/files/33649310055.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/tedudarabaze.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0724/files/4789412684.pdf
    • https://cdn.shopify.com/s/files/1/0437/4626/3201/files/guidance_and_counseling_definition.pdf
    • https://cdn.shopify.com/s/files/1/0428/4973/0727/files/gisaluxe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071c1.bin
4372523dc8c874695475561a7213c645e57b99120d6557d5ce3124e54c2f77bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C1 5472 bytes
font_01_sfnt_off0000845b.bin
4270d0fcb4402d78e22f6b7621b1670bbfcad43abfa3b9a620ed8adcb60c5c4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x845B 9980 bytes
font_02_sfnt_off0000a67c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xA67C 4324 bytes